Al ristorante lasciamo una piccola mancia perché la cameriera è stata gentilissima.

Al ristorante means at the restaurant.

It is made from:

• a = to / at
• il = the

So a + il = al.

In Italian, andare al ristorante, essere al ristorante, and mangiare al ristorante are very common ways to say to the restaurant / at the restaurant / in a restaurant setting.

Nel ristorante is also possible, but it more literally emphasizes being inside the restaurant. In many everyday situations, Italian prefers al ristorante where English might say either at the restaurant or in the restaurant.

Lasciamo is the 1st person plural form of lasciare: we leave.

Here it is in the present tense, and in context it often means something like:

• we leave
• we leave/are leaving
• we usually leave

Italian present tense is often broader than English present tense. Depending on context, it can correspond to:

• we leave
• we are leaving
• we do leave

So lasciamo una piccola mancia simply means we leave a small tip.

Una is the feminine singular form of the indefinite article, meaning a or an.

It is feminine because mancia is a feminine noun.

So:

• un libro = a book
• una casa = a house
• una mancia = a tip

The adjective piccola also matches the feminine singular noun mancia.

In Italian, adjectives can come before or after the noun, but the position can affect what sounds most natural.

Una piccola mancia is the normal, natural way to say a small tip.

A short, common adjective like piccolo often comes before the noun when it expresses a simple quality. Putting it after the noun is not always wrong, but it may sound less natural or slightly more marked depending on context.

So for a learner, the safest choice here is:

• una piccola mancia

Here perché means because.

The accent is important. Italian writes it with an accent on the final é.

Perché can mean:

• because
• why (in some questions)

Examples:

• Vado via perché sono stanco. = I’m leaving because I’m tired.
• Perché studi l’italiano? = Why do you study Italian?

So in your sentence, perché la cameriera è stata gentilissima means because the waitress was extremely kind.

La cameriera means the waitress.

• cameriere = waiter
• cameriera = waitress

It is feminine, so it takes:

• la as the article
• feminine adjective forms if needed

In this sentence, the speaker is specifically referring to a female server, so la cameriera is used.

È stata is the passato prossimo of essere and means was / has been.

It is formed with:

• è = is/has (auxiliary here)
• stata = been

So la cameriera è stata gentilissima literally means the waitress has been extremely kind, but in natural English it is often translated as the waitress was extremely kind.

Why not era?

• era describes a past state, often as background or something ongoing
• è stata presents the kindness as a completed fact, often connected to the present situation

Here, since the speakers are deciding to leave a tip because of the service they just received, è stata fits very well.

Because it agrees with la cameriera, which is feminine singular.

With essere in the passato prossimo, the past participle agrees in gender and number with the subject:

• lui è stato = he was / has been
• lei è stata = she was / has been
• loro sono stati = they were (masculine or mixed)
• loro sono state = they were (all feminine)

Since la cameriera is feminine singular, the correct form is stata.

Gentilissima is the absolute superlative of gentile.

• gentile = kind / polite
• gentilissimo / gentilissima = very kind / extremely kind / incredibly polite

Italian often forms this by adding -issimo to an adjective:

• buono → buonissimo
• bello → bellissimo
• gentile → gentilissimo / gentilissima

Because cameriera is feminine singular, the adjective becomes gentilissima.

So it means something stronger than just kind — more like very kind or extremely kind.

In lasciamo, the subject we is already built into the verb ending.

Italian often drops subject pronouns when they are not needed, because the verb form usually makes the subject clear.

For example:

• lascio = I leave
• lasci = you leave
• lasciamo = we leave

So lasciamo already means we leave. You could say noi lasciamo, but noi is usually only added for emphasis or contrast.

Yes, you could say Lasciamo una piccola mancia al ristorante.

Both are grammatical, but the focus changes slightly.

• Al ristorante lasciamo una piccola mancia... puts the setting first: At the restaurant, we leave a small tip...
• Lasciamo una piccola mancia al ristorante... starts with the action: We leave a small tip at the restaurant...

Italian word order is often more flexible than English, especially when moving a phrase to the front for emphasis or topic-setting.

Yes, mancia is the normal word for tip in contexts like restaurants, hotels, or taxis.

Examples:

• lasciare una mancia = to leave a tip
• dare una mancia = to give a tip

In this sentence, lasciamo una piccola mancia is a very natural expression.

You would change the feminine words to masculine where necessary:

• la cameriera → il cameriere
• gentilissima → gentilissimo

So the sentence would be:

Al ristorante lasciamo una piccola mancia perché il cameriere è stato gentilissimo.

Notice that è stato is masculine singular now, agreeing with il cameriere.